Fire-alarm protective device.



M. ARNAVAS.

FIRE ALARM PROTECTIVE DEVICE. APPLICATION FILED JULY 24. 1917.

1,267, 165. Patented May 21,1918.

INVENTOR ATTORNEY WrrNgssEs 6 i ,a/g u MARIO ARNAVAS, OF SAN FRANCISCO,CALIFORNIA.

FIRE-ALARM PROTECTIVE DEVICE.

Specification of Letters Patent.

Patented May 21, 1918.

Application filed July 24, 1917. Serial No. 182,475.

To all whom it may concern:

Be it known that I, MARIO ARNAvAs, a citizen of the Kingdom of Italy,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented new and useful Improvements in Fire- AlarmProtective Devices, of which the fol lowing is a specification.

This invention relates to improvements in fire alarm signal stations.

The invention deals particularly with that class of fire alarm signalstations in which a booth is provided having a door which isautomatically locked to detain the person sounding the alarm until thearrival of an authorized oflicial.

The principal object contemplated is the provision of a signal boxhaving a magnet controlled look a apted to be released by a doorcontrolled contact which will positively prevent transmission of asignal except when the door of the booth is closed and locked. I amaware that this object has been aimed at by previous inventors, but thecontacts hitherto utilized have not been sufficiently well protected toprevent tampering in the open position of the door.

Another object of the invention is to provide a type of contact andprotecting means, and mechanism therefor, which will be especiallyapplicable to circular booths having sliding doors.

One form of the invention is described in the specification below andillustrated in the drawings.

In the drawings Figure 1 is a front elevation of the booth.

Fig. 2 is a fragmentary longitudinal section through the contact tubeand associated parts.

Fig. 3 is a fragmentary view of the signal box illustrating thearrangement of the lock and controlling magnet for releasing the lock,and showing diagrammatically the electrical circuits involved.

Fig. 4 is a horizontal section through the booth on the line H of Fig.1.

In the drawings the booth, indicated as a whole by the numeral 1, isrepresented as of a conventional cylindrical form. It has a door 2 whichis slidably mounted for opening and closing movement as in guides 3. Thedoor 2 is normally disposed in a position to completely close the dooropening 4. It has a spring lock 5 which, however, does not becomeeffective to lock the door until the latter has been moved some littledistance beyond the normally closed position as indicated by dottedlines in Fig. 1. The lock 5 is preferably so arranged that it can onlybe released by employing a key in connection with an outwardly disposedkeyhole 6. Suitably mounted in a convenient position in the booth 1 isthe alarm signal box 7 inclosing the usual devices for signaling thecentral station, access to these devices being normally prevented by thedoor 8. A. magnetically released lock is provided for the door 8, andpreferably consists of a slotted bolt 9 slidably mounted on the innerside of the door 8 for movement to engage in and disengage from a recess10 in the box frame adjacent the door. The bolt 10 carries an armature11 disposed for attraction by magnet 12 properly secured on the door.Preferably the armature 11 constitutes an integrally formed T-head onthe end of the bolt 9. A suitable source of electricity is provided forenergizing the magnet 12 when a contact 13 is closed by movement of thedoor 2 to the position in which the lock 5 becomes effective.

In accordance with the invention, the con tact 13 is mounted in a tube14. toward a closed end 15. The tube 14 is secured to the booth 1, andpreferably over the doorway.

An upwardly extending arm 16 on the door carries an arcuate rod 17extending into the open end 20 of the tube 14: and is provided at theend with a contact head 18. The tube 14:, rod 17 and contact are soproportioned and arranged that the rod 17 will slide freely in the tubein the movement of the door while when the position of the door isreached in whi h it is secured by the lock 5 the contact head 18 willengage against and close the contact 13. The contact head 18 is of suchsize that it will completely obstruct the bore of the tube in allpositions of the door thereby preventing closure of the contact 13 bythe insertion of an elongated object through the open end 17.

When desired I may mount in a convenient position upon the booth 2 anelectric lamp 19 which may be lighted when the door is moved to lockingposition to call at tention to the fact that the signal mechanism of thebox has been operated.

The herein described embodiment of the invention, while consideredpreferable to other forms, is not to be interpreted as in any waylimiting the invention. I am aware that numerous other forms may be constructed Without departure from the spirit of the invention and-reservethe right t such variations, modifications, and use of equivalents asmay fall Within th'e'scope of the invention as indicated by the breadth,

of the" appended claims.

l/Vhat is claimed is: 1. The combination With the booth andsignalnmechanism of a firealarm: signalstaa tion, a tube mounted on thebooth, an element disposed 1n the tube and connected to the door or thebooth, said element adapted door. 7.

2; The c'ombinatioirwith the booth and signal box of a fire alarmsignalstation,.of a tubeimounted on the booth, an element disposed inthetubeand connected to the door of the booth, said element adapted for slid-;ing-niovement in the tube in the opening and closing; of the door andarranged to completelyrobstruct the tube in every positionof the-floor,a contact in said tube adapted to be closed by said elementinthc closedposition of the door, amagnet controlling the lock of the signal box,and a circuit for said magnet including said contact.

3. The combination with the booth and signal box ofa fire alarm signalstation, of a tube mounted'on the booth, an element disposed in the tubeand connected to the door of the'b'ooth, said element adaptedforsliding; movement in the tube in the opening and closing of the door andarranged to completely obstruct the'tube inr everyz-position of thedoor, a contact in said tube; adapted to be'closedby said element intheclosed'. position onthedoor, a magnet controlling the lock of thesignal box, a circuit for said.

magnet including said' contact, and aspring lock for the door of saidbooth.

4:. The combination with the booth, and

signal box of a fire alarm'signal station, of a sliding door forthe-b0oth, aspr 1ng lock for the door, a tube having one-end closedmounted on thebooth, a rodhaving a con-- tact head disposed Within thetube and'havingone end projecting from-the-open endof the tube andattached to the door, said contact head adapted to entirelyobstruct'said tube in every position of the door, atma'g'net,

controlling the lock-0f the signal box, a

said contact and said'magnet.

Intestimony whereof I aliix my signature.

MARIO ARNAVAS;

Copies this patent may be obtained for five cents each,- byaddressingtthe Commissioner of Patents;

, Washington, D. C.

contact in'said tube adapted :to be closed by: said contact'head in theclosed pOSllHOIIOf the door, nd clrcult connectlons"between;

